/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
/*
  Copyright (c) 2004-2011 QOS.ch
  All rights reserved.

  Permission is hereby granted, free  of charge, to any person obtaining
  a  copy  of this  software  and  associated  documentation files  (the
  "Software"), to  deal in  the Software without  restriction, including
  without limitation  the rights to  use, copy, modify,  merge, publish,
  distribute,  sublicense, and/or sell  copies of  the Software,  and to
  permit persons to whom the Software  is furnished to do so, subject to
  the following conditions:

  The  above  copyright  notice  and  this permission  notice  shall  be
  included in all copies or substantial portions of the Software.

  THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
  EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
  MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */
package io.netty.util.internal.logging;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

/**
 * <a href="https://logging.apache.org/log4j/1.2/index.html">Apache Log4J</a>
 * logger.
 */
class Log4JLogger extends AbstractInternalLogger {

    private static final long serialVersionUID = 2851357342488183058L;

    final transient Logger logger;

    /**
     * Following the pattern discussed in pages 162 through 168 of "The complete
     * log4j manual".
     */
    static final String FQCN = Log4JLogger.class.getName();

    // Does the log4j version in use recognize the TRACE level?
    // The trace level was introduced in log4j 1.2.12.
    final boolean traceCapable;

    Log4JLogger(Logger logger) {
        super(logger.getName());
        this.logger = logger;
        traceCapable = isTraceCapable();
    }

    private boolean isTraceCapable() {
        try {
            logger.isTraceEnabled();
            return true;
        } catch (NoSuchMethodError ignored) {
            return false;
        }
    }

    /**
     * Is this logger instance enabled for the TRACE level?
     *
     * @return True if this Logger is enabled for level TRACE, false otherwise.
     */
    @Override
    public boolean isTraceEnabled() {
        if (traceCapable) {
            return logger.isTraceEnabled();
        } else {
            return logger.isDebugEnabled();
        }
    }

    /**
     * Log a message object at level TRACE.
     *
     * @param msg
     *          - the message object to be logged
     */
    @Override
    public void trace(String msg) {
        logger.log(FQCN, traceCapable ? Level.TRACE : Level.DEBUG, msg, null);
    }

    /**
     * Log a message at level TRACE according to the specified format and
     * argument.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for level TRACE.
     * </p>
     *
     * @param format
     *          the format string
     * @param arg
     *          the argument
     */
    @Override
    public void trace(String format, Object arg) {
        if (isTraceEnabled()) {
            FormattingTuple ft = MessageFormatter.format(format, arg);
            logger.log(FQCN, traceCapable ? Level.TRACE : Level.DEBUG, ft
                    .getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log a message at level TRACE according to the specified format and
     * arguments.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the TRACE level.
     * </p>
     *
     * @param format
     *          the format string
     * @param argA
     *          the first argument
     * @param argB
     *          the second argument
     */
    @Override
    public void trace(String format, Object argA, Object argB) {
        if (isTraceEnabled()) {
            FormattingTuple ft = MessageFormatter.format(format, argA, argB);
            logger.log(FQCN, traceCapable ? Level.TRACE : Level.DEBUG, ft
                    .getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log a message at level TRACE according to the specified format and
     * arguments.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the TRACE level.
     * </p>
     *
     * @param format
     *          the format string
     * @param arguments
     *          an array of arguments
     */
    @Override
    public void trace(String format, Object... arguments) {
        if (isTraceEnabled()) {
            FormattingTuple ft = MessageFormatter.arrayFormat(format, arguments);
            logger.log(FQCN, traceCapable ? Level.TRACE : Level.DEBUG, ft
                    .getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log an exception (throwable) at level TRACE with an accompanying message.
     *
     * @param msg
     *          the message accompanying the exception
     * @param t
     *          the exception (throwable) to log
     */
    @Override
    public void trace(String msg, Throwable t) {
        logger.log(FQCN, traceCapable ? Level.TRACE : Level.DEBUG, msg, t);
    }

    /**
     * Is this logger instance enabled for the DEBUG level?
     *
     * @return True if this Logger is enabled for level DEBUG, false otherwise.
     */
    @Override
    public boolean isDebugEnabled() {
        return logger.isDebugEnabled();
    }

    /**
     * Log a message object at level DEBUG.
     *
     * @param msg
     *          - the message object to be logged
     */
    @Override
    public void debug(String msg) {
        logger.log(FQCN, Level.DEBUG, msg, null);
    }

    /**
     * Log a message at level DEBUG according to the specified format and
     * argument.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for level DEBUG.
     * </p>
     *
     * @param format
     *          the format string
     * @param arg
     *          the argument
     */
    @Override
    public void debug(String format, Object arg) {
        if (logger.isDebugEnabled()) {
            FormattingTuple ft = MessageFormatter.format(format, arg);
            logger.log(FQCN, Level.DEBUG, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log a message at level DEBUG according to the specified format and
     * arguments.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the DEBUG level.
     * </p>
     *
     * @param format
     *          the format string
     * @param argA
     *          the first argument
     * @param argB
     *          the second argument
     */
    @Override
    public void debug(String format, Object argA, Object argB) {
        if (logger.isDebugEnabled()) {
            FormattingTuple ft = MessageFormatter.format(format, argA, argB);
            logger.log(FQCN, Level.DEBUG, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log a message at level DEBUG according to the specified format and
     * arguments.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the DEBUG level.
     * </p>
     *
     * @param format
     *          the format string
     * @param arguments an array of arguments
     */
    @Override
    public void debug(String format, Object... arguments) {
        if (logger.isDebugEnabled()) {
            FormattingTuple ft = MessageFormatter.arrayFormat(format, arguments);
            logger.log(FQCN, Level.DEBUG, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log an exception (throwable) at level DEBUG with an accompanying message.
     *
     * @param msg
     *          the message accompanying the exception
     * @param t
     *          the exception (throwable) to log
     */
    @Override
    public void debug(String msg, Throwable t) {
        logger.log(FQCN, Level.DEBUG, msg, t);
    }

    /**
     * Is this logger instance enabled for the INFO level?
     *
     * @return True if this Logger is enabled for the INFO level, false otherwise.
     */
    @Override
    public boolean isInfoEnabled() {
        return logger.isInfoEnabled();
    }

    /**
     * Log a message object at the INFO level.
     *
     * @param msg
     *          - the message object to be logged
     */
    @Override
    public void info(String msg) {
        logger.log(FQCN, Level.INFO, msg, null);
    }

    /**
     * Log a message at level INFO according to the specified format and argument.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the INFO level.
     * </p>
     *
     * @param format
     *          the format string
     * @param arg
     *          the argument
     */
    @Override
    public void info(String format, Object arg) {
        if (logger.isInfoEnabled()) {
            FormattingTuple ft = MessageFormatter.format(format, arg);
            logger.log(FQCN, Level.INFO, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log a message at the INFO level according to the specified format and
     * arguments.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the INFO level.
     * </p>
     *
     * @param format
     *          the format string
     * @param argA
     *          the first argument
     * @param argB
     *          the second argument
     */
    @Override
    public void info(String format, Object argA, Object argB) {
        if (logger.isInfoEnabled()) {
            FormattingTuple ft = MessageFormatter.format(format, argA, argB);
            logger.log(FQCN, Level.INFO, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log a message at level INFO according to the specified format and
     * arguments.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the INFO level.
     * </p>
     *
     * @param format
     *          the format string
     * @param argArray
     *          an array of arguments
     */
    @Override
    public void info(String format, Object... argArray) {
        if (logger.isInfoEnabled()) {
            FormattingTuple ft = MessageFormatter.arrayFormat(format, argArray);
            logger.log(FQCN, Level.INFO, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log an exception (throwable) at the INFO level with an accompanying
     * message.
     *
     * @param msg
     *          the message accompanying the exception
     * @param t
     *          the exception (throwable) to log
     */
    @Override
    public void info(String msg, Throwable t) {
        logger.log(FQCN, Level.INFO, msg, t);
    }

    /**
     * Is this logger instance enabled for the WARN level?
     *
     * @return True if this Logger is enabled for the WARN level, false otherwise.
     */
    @Override
    public boolean isWarnEnabled() {
        return logger.isEnabledFor(Level.WARN);
    }

    /**
     * Log a message object at the WARN level.
     *
     * @param msg
     *          - the message object to be logged
     */
    @Override
    public void warn(String msg) {
        logger.log(FQCN, Level.WARN, msg, null);
    }

    /**
     * Log a message at the WARN level according to the specified format and
     * argument.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the WARN level.
     * </p>
     *
     * @param format
     *          the format string
     * @param arg
     *          the argument
     */
    @Override
    public void warn(String format, Object arg) {
        if (logger.isEnabledFor(Level.WARN)) {
            FormattingTuple ft = MessageFormatter.format(format, arg);
            logger.log(FQCN, Level.WARN, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log a message at the WARN level according to the specified format and
     * arguments.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the WARN level.
     * </p>
     *
     * @param format
     *          the format string
     * @param argA
     *          the first argument
     * @param argB
     *          the second argument
     */
    @Override
    public void warn(String format, Object argA, Object argB) {
        if (logger.isEnabledFor(Level.WARN)) {
            FormattingTuple ft = MessageFormatter.format(format, argA, argB);
            logger.log(FQCN, Level.WARN, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log a message at level WARN according to the specified format and
     * arguments.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the WARN level.
     * </p>
     *
     * @param format
     *          the format string
     * @param argArray
     *          an array of arguments
     */
    @Override
    public void warn(String format, Object... argArray) {
        if (logger.isEnabledFor(Level.WARN)) {
            FormattingTuple ft = MessageFormatter.arrayFormat(format, argArray);
            logger.log(FQCN, Level.WARN, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log an exception (throwable) at the WARN level with an accompanying
     * message.
     *
     * @param msg
     *          the message accompanying the exception
     * @param t
     *          the exception (throwable) to log
     */
    @Override
    public void warn(String msg, Throwable t) {
        logger.log(FQCN, Level.WARN, msg, t);
    }

    /**
     * Is this logger instance enabled for level ERROR?
     *
     * @return True if this Logger is enabled for level ERROR, false otherwise.
     */
    @Override
    public boolean isErrorEnabled() {
        return logger.isEnabledFor(Level.ERROR);
    }

    /**
     * Log a message object at the ERROR level.
     *
     * @param msg
     *          - the message object to be logged
     */
    @Override
    public void error(String msg) {
        logger.log(FQCN, Level.ERROR, msg, null);
    }

    /**
     * Log a message at the ERROR level according to the specified format and
     * argument.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the ERROR level.
     * </p>
     *
     * @param format
     *          the format string
     * @param arg
     *          the argument
     */
    @Override
    public void error(String format, Object arg) {
        if (logger.isEnabledFor(Level.ERROR)) {
            FormattingTuple ft = MessageFormatter.format(format, arg);
            logger.log(FQCN, Level.ERROR, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log a message at the ERROR level according to the specified format and
     * arguments.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the ERROR level.
     * </p>
     *
     * @param format
     *          the format string
     * @param argA
     *          the first argument
     * @param argB
     *          the second argument
     */
    @Override
    public void error(String format, Object argA, Object argB) {
        if (logger.isEnabledFor(Level.ERROR)) {
            FormattingTuple ft = MessageFormatter.format(format, argA, argB);
            logger.log(FQCN, Level.ERROR, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log a message at level ERROR according to the specified format and
     * arguments.
     *
     * <p>
     * This form avoids superfluous object creation when the logger is disabled
     * for the ERROR level.
     * </p>
     *
     * @param format
     *          the format string
     * @param argArray
     *          an array of arguments
     */
    @Override
    public void error(String format, Object... argArray) {
        if (logger.isEnabledFor(Level.ERROR)) {
            FormattingTuple ft = MessageFormatter.arrayFormat(format, argArray);
            logger.log(FQCN, Level.ERROR, ft.getMessage(), ft.getThrowable());
        }
    }

    /**
     * Log an exception (throwable) at the ERROR level with an accompanying
     * message.
     *
     * @param msg
     *          the message accompanying the exception
     * @param t
     *          the exception (throwable) to log
     */
    @Override
    public void error(String msg, Throwable t) {
        logger.log(FQCN, Level.ERROR, msg, t);
    }
}
